Foldable bicycle frame



FIG. 1 is a perspective view of a foldable bicycle frame showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view showing the foldable bicycle frame of FIG. 1 being assembled on a foldable bicycle.

The broken line showing of the foldable bicycle in FIG. 8 is for the purpose of illustrating environmental structure only and forms no part of the claimed design. 

The ornamental design for a foldable bicycle frame, as shown and described. 